Inflatable building block



FIG. 1 is a perspective view showing a first embodiment of my new inflatable building block design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a perspective view showing a second embodiment of my new inflatable building block design;

FIG. 9 is a front view thereof;

FIG. 10 is a rear view thereof;

FIG. 11 is a left side view thereof;

FIG. 12 is a right side view thereof;

FIG. 13 is a top view thereof; and,

FIG. 14 is a bottom view thereof.

The broken lines are for the purpose of illustrating portions of the article that form no part of the claim. 

CLAIM The ornamental design for an inflatable building block, as shown and described. 